Method of making rod packing



Dec. 27, ZERB] AUTOMATIC DEVICE FOR LIMITING THE SPEED OF INTERNALCOMBUSTION ENGINES, MORE PARTICULARLY OF TRACTOR ENGINES OR THE LIKEFiled May 28, 1950 F g 7 2 l 9 i 5 g H I 2 s 3 3 o o 5 I g 0 42' S 3 z I12/ s a I I 1 5 as m/J-w/ 5 Patented Jan. 10, 1933 v UNITED STATESWALTER K. QUEEN, OF NEEDHA'M HEIGHTS, MASSACHUSETTS mn'rrron or MAKINGnon PACKmG Application filed November 23, 1931. Serial No. 576,728.

It has been found that the packing ring of my United States LettersPatent 1,716,977, June 11, 1929, although well adapted for its intendedpurpose, as shown by an extensive public use, is subject to a certainlimitation, namely, that when the piston rod is removed for repairsthereto, or to the piston attached thereto, the packing is destroyedbecause the adhesive 'which retains the spirally-wound strip of asbestosin shape until it is placed in the stuffing box is dissipated by theheat to which it is subjected. E It is therefore the object of thepresent invention to provide a method of making a packing ring which hasall the advantages of the ring set forth in said Letters Patent, andwill retain its shape when removed from the stuffing box after a periodof use as, for example, when it becomes necessary for any 0 reason toremove the rod packed by said ring.

To this end therefore my invention contemplates the use of a singlehomogeneous, relatively-thick strip of packing material such as wovenfabric first arranged in cylindrical form with the ends thereof abutting(as distinguished from the cylinder formed by a plurality ofadhesively-secured turns of the relatively thin fabric strip describedin said Letters Patent) and the compression of the same into an annulushaving an outer con vex conical surface and an inner concave conicalsurface with a slit through the wall thereof.

My invention will be described by reference to the accompanying drawingwhich is to be taken as illustrative and not restrictive. In saiddrawing,-

Figure 1 is a plan View of a relatively thick strip of packing material,for example, 0 woven fabric such as asbestos cotton wool and the like,with or without wire insertion;

Fig. 2 is a transverse section taken on the line 2--2 of Fig. 1;

Fig. 3 is a vertical section of a cylindrical ring formed by thefabric-strip shown in Fig. 1; j

Fig. 4 is a section, certain parts being shown in elevation, of a diewhereby the cylindrical ring shown in Fig. 2 is converted 00 into anannulus having an outer convex conical surface and an inner concavefionical surface;

Fig. 5 is an elevation of the completed packing ring constructed inaccordance with the present invention.

In the particular drawing selected to illustratethe apparatus employedfor practicing my method, 10 is a single, coherent, homogeneous,relatively-thick strip of packing material such as woven fabric, forexample, woven asbestos, which may be provided with wire insertion, asindicated at 11. The said strip of woven fabric is much thicker than therelatively-thin helically-wound strips described in my prior patent, thethickness in fact bein substantially equal to that of the wall of t 1ecylinder formed by a number of spiral winds of said relatively-thinstrip shown in Fig. 6 of said patent.

The ends 12 of the fabric strip preferably .areinclined to the longsides thereof, al-

though they may be at right angles thereto. Thefabric strip is arranged"in cylindrical. form, as indicated in Fig. 3, with the @ds thereofabutting, and is then placed in a die plate 13 having a cone-shapeddepression and compressed by the die member 14 having a conical portioncorresponding with the cone-shaped depression of the die plate.

As the result of such compression there is formed an annulus having anouter convex conical surface 15 and an inner concave conical surface 16,the said surfaces preferably being parallel and uniting the concentriccylindrical working edges 17, 18 which, when the packing ring is in use,are in contact, respectively, with the rod to be packed and the innerperiphery of the stuffing box. As indicated in Fig. 5, the wall oftheannulus is slit, and where the ends of the strip 10 are inclined to thelength thereof, such slit will be angularly related with respect to ageneratrixt of the conical surfacesof the finished packing ring.

The packing ring formed in accordance with the present invention is usedin precisely the same manner set forth in my prior patent and isself-setting because the pressure a ainst which the rod is, to be packedacts oil the forward portion of the working edge "x 11y prioipat glut1iis be liment of my invention and means whereby 11y methaci may bereallzed 1n practlce, wlth- 011i: howevev innitmg myself thereto, What i12. .2111: and desire to secure by Letters Patent A method of making asiitted frustoa1 packing-ring which consiss in cut-ting single,homogeneous, relativelyvi of woven fabric each the same 1 e l iwih'thereef, disposing said with the finds ihers dieing the same into c0-Ago-001111011]. annulus. hereof, I have hereunto subthis day ofNovember,

T1333 QUEEN.

